\begin{figure}[htb]
	\centering
	
	\begin{pdfpic}
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\rput(2.015254,0.56248045){$v_u$}
\usefont{T1}{ptm}{m}{n}
\rput(1.975791,-0.69751954){$v_t$}
\usefont{T1}{ptm}{m}{n}
\rput(0.13183594,1.1624805){$v_l$}
\usefont{T1}{ptm}{m}{n}
\rput(3.8066015,-1.3775195){$v_r$}
\usefont{T1}{ptm}{m}{n}
\rput(7.8492384,0.02248047){$v_s$}
\usefont{T1}{ptm}{m}{n}
\rput(6.011836,1.2824805){$v_l$}
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\rput(9.766602,-1.3375195){$v_r$}
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\rput(4.9266505,-2.8975196){$ecol$}
\usefont{T1}{ptm}{m}{n}
\rput(4.815791,2.8624804){$vsplit$}
\usefont{T1}{ptm}{m}{n}
\rput(1.4939454,0.22248048){$p_l$}
\usefont{T1}{ptm}{m}{n}
\rput(2.5487108,-0.37751952){$p_r$}
\usefont{T1}{ptm}{m}{n}
\rput(1.1856543,1.1424805){$p_{u1}$}
\usefont{T1}{ptm}{m}{n}
\rput(2.1001563,1.4024805){$p_{u2}$}
\usefont{T1}{ptm}{m}{n}
\rput(2.8526855,0.94248044){$p_{u3}$}
\usefont{T1}{ptm}{m}{n}
\rput(3.2213867,0.0024804687){$p_{u4}$}
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\rput(0.7656543,-0.09751953){$p_{t1}$}
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\rput(0.90015626,-0.99751955){$p_{t2}$}
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\rput(1.6526855,-1.4975195){$p_{t3}$}
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\rput(2.6013868,-1.3375195){$p_{t4}$}
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\rput(6.935654,1.1224805){$p_1$}
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\rput(7.8501563,1.3824805){$p_2$}
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\rput(8.602686,0.92248046){$p_3$}
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\rput(8.9113865,-0.17751953){$p_4$}
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\rput(6.647256,0.12248047){$p_8$}
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\rput(6.789629,-0.7775195){$p_7$}
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\rput(7.5506835,-1.3775195){$p_6$}
\usefont{T1}{ptm}{m}{n}
\rput(8.485762,-1.0775195){$p_5$}
	\end{pdfpic} 
	\caption[$ecol$ Illustrations]{$ecol$ Illustrations: edge connecting vertices $v_u$ and $v_t$ are collapsed to a new vertex $v_s$. And corresponding faces of \emph{cut vertices} $p_l$ and $p_r$ are eliminated.}
	\label{fig:ecol:illu}

\end{figure}